Camera optical lens

ABSTRACT

The present disclosure discloses a camera optical lens, which includes, from an object-side to an-image side: a first lens having a positive refractive power, a second, third, fourth, fifth, sixth, seventh and eight lens, which satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and 2.50≤(R7+R8)/(R7−R8)≤15.00; where f denotes a focal length of the camera optical lens; TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optic axis; f2 denotes a focal length of the second lens; R7 denotes a curvature radius of an object-side surface of the fourth lens; R8 denotes a curvature radius of an image-side surface of the fourth lens. The camera optical lens can achieve good optical performance while meeting the design requirement for large aperture, long focal length and ultra-thinness (in a camera optical lens with the long focal length).

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, inparticular to a camera optical lens suitable for handheld devices, suchas smart phones and digital cameras, and imaging devices, such asmonitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand forminiature camera lens is increasing day by day, but in general thephotosensitive devices of camera lens are nothing more than ChargeCoupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor(CMOS sensor), and as the progress of the semiconductor manufacturingtechnology makes the pixel size of the photosensitive devices becomesmaller, plus the current development trend of electronic productstowards better functions and thinner and smaller dimensions, miniaturecamera lens with good imaging quality therefore have become a mainstreamin the market.

In order to obtain better imaging quality, the lens that istraditionally equipped in mobile phone cameras adopts a three-piece,four-piece, or even five-piece or six-piece lens structure. However,with the development of technology and the increase of the diversedemands of users, and as the pixel area of photosensitive devices isbecoming smaller and smaller and the requirement of the camera opticallens on the imaging quality is improving constantly, the eight-piecelens structure gradually appears in lens designs. Although the typicaleight-piece lens already has good optical performance, its opticalpower, lens spacing and lens shape remain unreasonable to some extents,resulting in that the lens structure, which, even though, has excellentoptical performance, is not able to meet the design requirement forlarge aperture, ultra-thinness and long focal length.

SUMMARY

A camera optical lens is provided, which includes, from an object sideto an image side in sequence: a first lens having a positive refractivepower, a second lens, a third lens, a fourth lens, a fifth lens, a sixthlens, a seventh lens and an eight lens; wherein the camera optical lenssatisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and2.50≤(R7+R8)/(R7−R8)≤15.00; where f denotes a focal length of the cameraoptical lens; TTL denotes a total optical length from an object-sidesurface of the first lens to an image surface of the camera optical lensalong an optical axis; f2 denotes a focal length of the second lens; R7denotes a central curvature radius of an object-side surface of thefourth lens; and R8 denotes a central curvature radius of an image-sidesurface of the fourth lens.

As an improvement, the camera optical lens further satisfies thefollowing condition: 2.00≤d12/d14≤7.50; where d12 denotes an on-axisdistance from an image-side surface of the sixth lens to an object-sidesurface of the seventh lens; and d14 denotes an on-axis distance from animage-side surface of the seventh lens to an object-side surface of theeighth lens.

As an improvement, the camera optical lens further satisfies followingconditions: 0.60≤f1/f≤2.28; −9.39≤(R1+R2)/(R1−R2)≤−1.91; and0.05≤d1/TTL≤0.16; where f1 denotes a focal length of the first lens; R1denotes a central curvature radius of the object-side surface of thefirst lens; R2 denotes a central curvature radius of an image-sidesurface of the first lens; and d1 denotes an on-axis thickness of thefirst lens.

As an improvement, the camera optical lens further satisfies followingconditions: 1.64≤(R3+R4)/(R3−R4)≤9.23; and 0.02≤d3/TTL≤0.06; where R3denotes a central curvature radius of an object-side surface of thesecond lens; R4 denotes a central curvature radius of an image-sidesurface of the second lens; and d3 denotes an on-axis thickness of thesecond lens.

As an improvement, the camera optical lens further satisfies followingconditions: 0.33≤f3/f≤1.33; −0.10≤(R5+R6)/(R5−R6)≤0.35; and0.04≤d5/TTL≤0.14; where f3 denotes a focal length of the third lens; R5denotes a central curvature radius of an object-side surface of thethird lens; R6 denotes a central curvature radius of an image-sidesurface of the third lens; and d5 denotes an on-axis thickness of thethird lens.

As an improvement, wherein the camera optical lens further satisfiesfollowing conditions: −14.26≤f4/f≤−0.81; and 0.02≤d7/TTL≤0.08; where f4denotes a focal length of the fourth lens; and d7 denotes an on-axisthickness of the fourth lens.

As an improvement, the camera optical lens further satisfies followingconditions: −3.69≤f5≤/f≤−0.95; −0.34≤(R9+R10)/(R9−R10)≤0.10; and0.02≤≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9denotes a central curvature radius of an object-side surface of thefifth lens; R10 denotes a central curvature radius of an image-sidesurface of the fifth lens; and d9 denotes an on-axis thickness of thefifth lens.

As an improvement, the camera optical lens further satisfies followingconditions: 0.60≤f6/f≤2.30; −6.85≤(R11+R12)/(R11−R12)≤−2.05; and0.03≤d11/TTL≤0.10; where f6 denotes a focal length of the sixth lens;R11 denotes a central curvature radius of an object-side surface of thesixth lens; R12 denotes a central curvature radius of an image-sidesurface of the sixth lens; and d11 denotes an on-axis thickness of thesixth lens.

As an improvement, the camera optical lens further satisfies followingconditions: −2.14≤f7/f≤−0.52; −1.06≤(R13+R14)/(R13−R14)≤1.04; and0.04≤d13/TTL≤0.13; where f7 denotes a focal length of the seventh lens;R13 denotes a central curvature radius of an object-side surface of theseventh lens; R14 denotes a central curvature radius of an image-sidesurface of the seventh lens; and d13 denotes an on-axis thickness of theseventh lens.

As an improvement, the camera optical lens further satisfies followingconditions: −106.85≤f8/f≤−3.73; 1.81≤(R15+R16)/(R15-R16)≤48.17; and0.03≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens;R15 denotes a central curvature radius of an object-side surface of theeighth lens; R16 denotes a central curvature radius of an image-sidesurface of the eighth lens; and d15 denotes an on-axis thickness of theeighth lens.

As an improvement, the camera optical lens further satisfies followingconditions: f/IH≥2.33; where IH denotes an image height of the cameraoptical lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments ofthe present disclosure or in the prior art more clearly, theaccompanying drawings for describing the embodiments or the prior artare introduced briefly in the following. Apparently, the accompanyingdrawings in the following description are only some embodiments of thepresent disclosure, and persons of ordinary skill in the art can deriveother drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lensaccording to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of thecamera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the presentdisclosure clearer, embodiments of the present disclosure are describedin detail with reference to accompanying drawings in the following. Aperson of ordinary skill in the art can understand that, in theembodiments of the present disclosure, many technical details areprovided to make readers better understand the present disclosure.However, even without these technical details and any changes andmodifications based on the following embodiments, technical solutionsrequired to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides acamera optical lens 10. FIG. 1 shows a camera optical lens 10 providedin Embodiment 1 of the present disclosure, and the camera optical lens10 includes eight lenses. Specifically, the camera optical lens 10includes, from an object side to an image side in sequence: an apertureS1, a first lens L1, a second lens L2, a third lens L3, a fourth lensL4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and an eighthlens L8. An optical element such as an optical filter GF can be arrangedbetween the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power,the second lens L2 has a negative refractive power, the third lens L3has a positive refractive power, the fourth lens L4 has a negativerefractive power, the fifth lens L5 has a negative refractive power, thesixth lens L6 has a positive refractive power, the seventh lens L7 has anegative refractive power and the eighth lens L8 has a negativerefractive power. In this embodiment, the first lens L1 has a positiverefractive power, which facilitates improvement of optical performanceof the camera optical lens. It should be understood that in otherembodiments, the third lens L3, the fourth lens L4, the fifth lens L5,the sixth lens L6, the seventh lens L7 and the eighth lens L8 may haveother refractive power.

In this embodiment, the first lens L1, the second lens L2, the thirdlens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, theseventh lens L7 and the eighth lens L8 are made of plastic material. Inother embodiments, the lenses may be made of other material.

In this embodiment, a focal length of the camera optical lens 10 isdefined as f, a total optical length from an object-side surface of thefirst lens L1 to an image surface Si of the camera optical lens 10 alongan optical axis is defined as TTL. The camera optical lens 10 satisfiesfollowing conditions: 0.95≤f/TTL, which specifies a ratio of the focallength f of the camera optical lens 10 and the total optical length TTLfrom the object-side surface of the first lens L1 to the image surfaceSi of the camera optical lens 10 along the optical axis. Given the sameoptical length, the camera optical lens 10 has a longer focal length.

A focal length of the second lens L2 is defined as f2. The cameraoptical lens 10 satisfies following conditions: −4.00≤f2/f≤−2.00, whichspecifies a ratio of the focal length f2 of the second lens L2 and thefocal length f of the camera optical lens 10, which can effectivelybalance a spherical aberration and a field curvature of the cameraoptical lens.

A central curvature radius of an object-side surface of the fourth lensL4 is defined as R7, and a central curvature radius of an image-sidesurface of the fourth lens L4 is defined as R8. The camera optical lens10 satisfies following conditions: 2.50≤(R7+R8)/(R7−R8)≤15.00, whichspecifies a shape of the fourth lens L4. Within this range, a deflectiondegree of lights passing through the lens can be alleviated, and theaberration can be effectively reduced.

An on-axis distance from an image-side surface of the sixth lens L6 toan object-side surface of the seventh lens L7 is defined as d12, and anon-axis distance from an image-side surface of the seventh lens L7 to anobject-side surface of the eighth lens L8 is defined as d14. The cameraoptical lens 10 satisfies following conditions: 2.00≤d12/d14≤7.50, whichspecifies a shape of the on-axis distance d12 from the image-sidesurface of the sixth lens L6 to the object-side surface of the seventhlens L7 and the on-axis distance d14 from the image-side surface of theseventh lens L7 to the object-side surface of the eighth lens L8. Withinthis range, it is beneficial for reducing the total optical length ofthe camera optical lens and a development of the lenses towardsultra-thinness. Preferably, the camera optical lens 10 further satisfiesthe following condition: 2.16≤d12/d14≤7.49.

In this embodiment, the first lens L1 includes an object-side surfacebeing convex in a paraxial region and an image-side surface beingconcave in the paraxial region.

A focal length of the first lens L1 is defined as f1. The camera opticallens 10 satisfies the following condition: 0.60≤f1/f≤2.28, whichspecifies a ratio of the focal length f1 of the first lens L1 to thefocal length f of the camera optical lens 10. Within this range, thefirst lens L1 has an appropriate positive refractive power, which isbeneficial for reducing the aberration of the camera optical lens and adevelopment of the lenses towards ultra-thinness. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.96≤f1/f≤1.82.

A central curvature radius of the object-side surface of the first lensL1 is defined as R1, and a central curvature radius of an image-sidesurface of the first lens L1 is defined as R2. The camera optical lens10 satisfies the following condition: −9.39≤(R1+R2)/(R1−R2)≤−1.91. Thiscan reasonably control a shape of the first lens L1 in such a mannerthat the first lens L1 can effectively correct the spherical aberrationof the camera optical lens. Preferably, the camera optical lens 10satisfies the following condition: −5.87≤(R1+R2)/(R1−R2)≤−2.38.

An on-axis thickness of the first lens L1 is defined as d1, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.05≤d1/TTL≤0.16. Within this range, it isbeneficial for realization of ultra-thin lenses. This can facilitateachieving ultra-thinness of the lenses. Preferably, the camera opticallens 10 satisfies the following condition: 0.08≤d1/TTL≤0.13.

In this embodiment, the second lens L2 includes an object-side surfacebeing convex in the paraxial region and an image-side surface beingconcave in the paraxial region.

A central curvature radius of an object-side surface of the second lensL2 is defined as R3, and a central curvature radius of an image-sidesurface of the second lens L2 is defined as R4. The camera optical lens10 satisfies the following condition: 1.64≤(R3+R4)/(R3−R4)≤9.23, whichspecifies a shape of the second lens L2. Within this range, adevelopment of the lenses towards ultra-thinness would facilitatecorrecting an on-axis chromatic aberration. Preferably, the cameraoptical lens 10 satisfies the following condition:2.63≤(R3+R4)/(R3−R4)≤7.39.

An on-axis thickness of the second lens L2 is defined as d3, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.02≤d3/TTL≤0.06. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.03≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surfacebeing convex in the paraxial region and an image-side surface beingconvex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the third lens L3 is defined as f3. The camera opticallens 10 satisfies the following condition: 0.33≤f3/f≤1.33. Withreasonable distribution of the refractive power, the camera optical lenshas better imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.53≤f3/f≤1.06.

A central curvature radius of an object-side surface of the third lensL3 is defined as R5; and a central curvature radius of an image-sidesurface of the third lens L3 is defined as R6. The camera optical lens10 satisfies the following condition: −0.10≤(R5+R6)/(R5−R6)≤0.35, whichspecifies a shape of the third lens L3. Within this range, a deflectiondegree of lights passing through the lens can be alleviated, and theaberration can be effectively reduced. Preferably, the camera opticallens 10 satisfies the following condition: −0.06≤(R5+R6)/(R5−R6)≤0.28.

The on-axis thickness of the third lens L3 is defined as d5, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.04≤d5/TTL≤0.14. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.07≤d5/TTL≤0.11.

In this embodiment, the fourth lens L4 includes an object-side surfacebeing convex in the paraxial region and an image-side surface beingconcave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the fourth lens L4 is defined as f4. The camera opticallens 10 satisfies the following condition: −14.26≤f4/f≤−0.81. Withreasonable distribution of the refractive power, the camera optical lenshas better imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: −8.91≤f4/f≤−1.01.

An on-axis thickness of the fourth lens L4 is defined as d7, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.02≤d7/TTL≤0.08. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.04≤d7/TTL≤0.07.

In this embodiment, the fifth lens L5 includes an object-side surfacebeing concave in the paraxial region and an image-side surface beingconcave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the fifth lens L5 is defined as f5. The camera opticallens 10 satisfies the following condition: −3.69≤f5/f≤−0.95, which caneffectively make a light angle of the camera lens gentle and reducetolerance sensitivity. Preferably, the camera optical lens 10 satisfiesthe following condition: −2.31≤f5/f≤−1.19.

A central curvature radius of an object-side surface of the fifth lensL5 is defined as R9, and a central curvature radius of an image-sidesurface of the fifth lens L5 is defined as R10. The camera optical lens10 satisfies the following condition: −0.34≤(R9+R10)/(R9−R10)≤0.10,which specifies a shape of the fifth lens L5. Within this range, thedevelopment of the lenses towards ultra-thinness and wide angle wouldfacilitate correcting the off-axis aberration. Preferably, the cameraoptical lens 10 satisfies the following condition:−0.21≤(R9+R10)/(R9−R10)≤0.08.

An on-axis thickness of the fifth lens L5 is defined as d9, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.02≤d9/TTL≤0.06. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.03≤d9/TTL≤0.05.

In this embodiment, the sixth lens L6 includes an object-side surfacebeing convex in the paraxial region and an image-side surface beingconcave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the sixth lens L6 is defined as f6. The camera opticallens 10 satisfies the following condition: 0.60≤f6/f≤2.30. Withreasonable distribution of the refractive power, the camera optical lenshas better imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.96≤f6/f≤1.84.

A central curvature radius of an object-side surface of the sixth lensL6 is defined as R11, and a central curvature radius of an image-sidesurface of the sixth lens L6 is defined as R12. The camera optical lens10 satisfies the following condition: −6.85≤(R11+R12)/(R11−R12)≤−2.05,which specifies a shape of the sixth lens L6. Within this range, thedevelopment of the lenses towards ultra-thinness and wide angle wouldfacilitate correcting the off-axis aberration. Preferably, the cameraoptical lens 10 satisfies the following condition:−4.28≤(R11+R12)/(R11−R12)≤−2.57.

An on-axis thickness of the sixth lens L6 is defined as d11, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.03≤d11/TTL≤0.10. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.05≤d11/TTL≤0.08.

In this embodiment, the seventh lens L7 includes an object-side surfacebeing concave in the paraxial region and an image-side surface beingconcave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the seventh lens L7 is defined as f7. The camera opticallens 10 satisfies the following condition: −2.14≤f7/f≤−0.52. Within thisrange, with reasonable distribution of the refractive power, the cameraoptical lens has better imaging quality and lower sensitivity.Preferably, the camera optical lens 10 satisfies the followingcondition: −1.33≤f7/f≤−0.65.

A central curvature radius of an object-side surface of the seventh lensL7 is defined as R13, and a central curvature radius of an image-sidesurface of the seventh lens L7 is defined as R14. The camera opticallens 10 satisfies the following condition:−1.06≤(R13+R14)/(R13-R14)≤1.04, which specifies a shape of the seventhlens L7. Within this range, the development of the lenses towardsultra-thinness would facilitate correcting the off-axis aberration.Preferably, the camera optical lens 10 satisfies the followingcondition: −0.66≤(R13+R14)/(R13-R14)≤0.83.

An on-axis thickness of the seventh lens L7 is defined as d13, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.04≤d13/TTL≤0.13. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.07≤d13/TTL≤0.11.

In this embodiment, the eighth lens L8 includes an object-side surfacebeing convex in the paraxial region and an image-side surface beingconcave in the paraxial region. It should be appreciated that, in otherembodiments, configuration of object-side surfaces and image-sidesurfaces of the first lens L1, the second lens L2, the third lens L3,the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventhlens L7 and the eighth lens L8 may have a distribution in convex andconcave other than that of the above-described embodiment.

The focal length of the camera optical lens 10 is defined as f, and afocal length of the eighth lens L8 is defined as f8. The camera opticallens 10 satisfies the following condition: −106.85≤f8/f≤−3.73. Withreasonable distribution of the refractive power, the camera optical lenshas better imaging quality and lower sensitivity. Preferably, the cameraoptical lens 10 satisfies the following condition: −66.78≤f8/f≤−4.66.

A central curvature radius of an object-side surface of the eighth lensL8 is defined as R15, and a central curvature radius of an image-sidesurface of the eighth lens L8 is defined as R16. The camera optical lens10 satisfies the following condition: 1.81≤(R15+R16)/(R15-R16)≤48.17,which specifies a shape of the eighth lens L8. Within this range, thedevelopment of the lenses towards ultra-thinness and wide angle wouldfacilitate correcting the off-axis aberration. Preferably, the cameraoptical lens 10 satisfies the following condition:2.89≤(R15+R16)/(R15−R16)≤38.54.

An on-axis thickness of the eighth lens L8 is defined as d15, and thetotal optical length from the object-side surface of the first lens L1to the image surface Si of the camera optical lens 10 along the opticalaxis is defined as TTL. The camera optical lens 10 satisfies thefollowing condition: 0.03≤d15/TTL≤0.10. Within this range, it isbeneficial for realization of ultra-thin lenses. Preferably, the cameraoptical lens 10 satisfies the following condition: 0.05≤d15/TTL≤0.08.

In this embodiment, the image height of the camera optical lens 10 isdefined as IH, and the total optical length from the object-side surfaceof the first lens L1 to the image surface Si of the camera optical lens10 along the optical axis is defined as TTL. The camera optical lens 10satisfies the following condition: TTL/IH≤2.45, which is beneficial forrealization of ultra-thin lenses.

In an embodiment, an F number of the camera optical lens 10 is less thanor equal to 1.95, thus achieving large aperture and better imagingperformance of the camera optical lens 10.

In this embodiment, the focal length of the camera optical lens 10 isdefined as f, and an image height of 1.0H of the camera optical lens 10is defined as IH. The camera optical lens 10 satisfies the followingcondition: f/IH≥2.33, which makes the camera optical lens 10 have a longfocal length.

When the above conditions are satisfied, the camera optical lens 10meets the design requirement for large aperture, long focal length andultra-thinness (in a camera optical lens with the long focal length)while having excellent optical imaging performance. Based on thecharacteristics of the camera optical lens 10, the camera optical lens10 is particularly applicable to mobile camera lens assemblies and WEBcamera lenses composed of such camera elements as CCD and CMOS for highpixels.

The camera optical lens 10 will be further described with reference tothe following examples. Symbols used in various examples are shown asfollows. The focal length, on-axis distance, central curvature radius,on-axis thickness, inflexion point position, and arrest point positionare all in units of mm.

TTL: Total optical length (the distance from the object side surface ofthe first lens L1 to the image surface Si of the camera optical lensalong the optical axis) in mm.

FNO: Ratio of an effective focal length and an entrance pupil diameterof the camera optical lens.

Preferably, inflexion points and/or arrest points can be arranged on theobject-side surface and/or the image-side surface of each lens, so as tosatisfy the demand for high quality imaging. The description below canbe referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of thepresent disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd vd S1 ∞ d0= −0.313 R1 1.878 d1= 0.567 nd1 1.5450 v1 55.81R2 2.895 d2= 0.055 R3 5.313 d3= 0.207 nd2 1.6700 v2 19.39 R4 3.828 d4=0.055 R5 4.922 d5= 0.511 nd3 1.5450 v3 55.81 R6 −3.058 d6= 0.035 R75.515 d7= 0.307 nd4 1.6700 v4 19.39 R8 2.393 d8= 0.242 R9 −14.197 d9=0.234 nd5 1.6610 v5 20.53 R10 12.474 d10= 0.105 R11 2.219 d11= 0.376 nd61.6610 v6 20.53 R12 4.281 d12= 0.897 R13 −3.03 d13= 0.500 nd7 1.5450 v755.81 R14 9.853 d14= 0.120 R15 7.053 d15= 0.360 nd8 1.5450 v8 55.81 R166.627 d16= 0.255 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.552

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: a central curvature radius of an optical surface;

R1: central curvature radius of the object-side surface of the firstlens L1;

R2: central curvature radius of the image-side surface of the first lensL1;

R3: central curvature radius of the object-side surface of the secondlens L2;

R4: central curvature radius of the image-side surface of the secondlens L2;

R5: central curvature radius of the object-side surface of the thirdlens L3;

R6: central curvature radius of the image-side surface of the third lensL3;

R7: central curvature radius of the object-side surface of the fourthlens L4;

R8: central curvature radius of the image-side surface of the fourthlens L4;

R9: central curvature radius of the object-side surface of the fifthlens L5;

R10: central curvature radius of the image-side surface of the fifthlens L5;

R11: central curvature radius of the object-side surface of the sixthlens L6;

R12: central curvature radius of the image-side surface of the sixthlens L6;

R13: central curvature radius of the object-side surface of the seventhlens L7;

R14: central curvature radius of the image-side surface of the seventhlens L7;

R15: central curvature radius of an object-side surface of the eighthlens L8;

R16: central curvature radius of an image-side surface of the eighthlens L8;

R17: central curvature radius of an object-side surface of the opticalfilter GF;

R18: central curvature radius of an image-side surface of the opticalfilter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object-side surface ofthe first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 tothe object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 tothe object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5to the object-side surface of the six lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7to the object-side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image-side surface of the eighth lens L8to the object-side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image-side surface of the optical filterGF to the image surface Si;

nd: refractive index of a d line;

nd1: refractive index of a d line of the first lens L1;

nd2: refractive index of a d line of the second lens L2;

nd3: refractive index of a d line of the third lens L3;

nd4: refractive index of a d line of the fourth lens L4;

nd5: refractive index of a d line of the fifth lens L5;

nd6: refractive index of a d line of the sixth lens L6;

nd7: refractive index of a d line of the seventh lens L7;

nd8: refractive index of a d line of the eighth lens L8;

ndg: refractive index of a d line of the optical filter GF;

νd: abbe number;

ν1: abbe number of the first lens L1;

ν2: abbe number of the second lens L2;

ν3: abbe number of the third lens L3;

ν4: abbe number of the fourth lens L4;

ν5: abbe number of the fifth lens L5;

ν6: abbe number of the sixth lens L6;

ν7: abbe number of the seventh lens L7;

ν8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 inEmbodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −2.3615E+00  9.0139E−03 9.1109E−03 −9.8809E−02 1.9581E−01−2.4305E−01 R2 −4.4281E+01 −5.9045E−02 1.4625E−01 −3.9876E−01 3.5262E−01 5.0301E−02 R3 −6.1882E+00 −2.7178E−01 8.7973E−01 −1.8040E+00 2.1942E+00−1.6547E+00 R4 −6.2221E+01  1.9292E−02 2.7126E−02 −3.7425E−01 7.4652E−01−7.7112E−01 R5  1.0855E+01  3.7047E−02 −3.6111E−01   2.3880E−016.3545E−01 −1.3048E+00 R6 −7.9958E+01  3.6498E−01 −2.0566E+00  5.1826E+00 −7.8196E+00   7.7931E+00 R7 −9.1723E+01  3.4402E−01−2.0304E+00   4.7105E+00 −6.7474E+00   6.5470E+00 R8 −4.8123E+00−2.6002E−01 8.8537E−01 −3.2902E+00 7.3057E+00 −1.0007E+01 R9 −2.0012E+03 9.5398E−02 8.0552E−01 −3.1660E+00 5.4531E+00 −5.7128E+00 R10 9.8225E+01  9.7749E−02 4.5682E−01 −1.9886E+00 3.1302E+00 −2.9230E+00R11 −1.0389E+01 −1.9032E−02 5.4938E−02 −1.9269E−01 2.3916E−01 3.5616E−02 R12 −5.8026E+00 −2.0200E−02 −1.4483E−02   1.5354E−01−4.9467E−02  −3.7251E−01 R13 −2.8368E+01 −1.8755E−01 −4.9645E−02  6.1109E−01 −2.0646E+00   3.7919E+00 R14  9.5962E+00 −8.6931E−02−1.2964E−01   6.1981E−01 −1.1123E+00   1.0693E+00 R15 −1.1893E+01−2.3536E−01 1.9956E−02  5.2475E−01 −8.9131E−01   6.8119E−01 R16−8.8357E+01 −1.7197E−01 4.2127E−02  1.4352E−01 −2.2544E−01   1.6156E−01Conic coefficient Aspheric surface coefficients k A14 A16 A18 A20 R1−2.3615E+00  1.8603E−01 −8.5472E−02  2.1486E−02 −2.2527E−03 R2−4.4281E+01 −2.8478E−01  1.9628E−01 −5.8424E−02  6.7232E−03 R3−6.1882E+00  7.7198E−01 −2.0961E−01  2.7918E−02 −1.0244E−03 R4−6.2221E+01  4.7193E−01 −1.6931E−01  3.2188E−02 −2.4215E−03 R5 1.0855E+01  1.1419E+00 −5.5913E−01  1.4991E−01 −1.7283E−02 R6−7.9958E+01 −5.1568E+00  2.1687E+00 −5.2242E−01  5.4682E−02 R7−9.1723E+01 −4.2888E+00  1.8104E+00 −4.4305E−01  4.7635E−02 R8−4.8123E+00  8.8181E+00 −4.8881E+00  1.5531E+00 −2.1471E−01 R9−2.0012E+03  3.7808E+00 −1.5215E+00  3.3689E−01 −3.1318E−02 R10 9.8225E+01  1.7615E+00 −6.7013E−01  1.4509E−01 −1.3486E−02 R11−1.0389E+01 −2.3992E−01  1.6433E−01 −4.5796E−02  4.7076E−03 R12−5.8026E+00  1.0224E+00 −1.1327E+00  5.6732E−01 −1.0674E−01 R13−2.8368E+01 −4.0885E+00  2.6141E+00 −9.2275E−01  1.3862E−01 R14 9.5962E+00 −6.1259E−01  2.1146E−01 −4.1049E−02  3.4710E−03 R15−1.1893E+01 −2.7847E−01  5.8471E−02 −4.7370E−03 −5.2818E−05 R16−8.8357E+01 −6.7417E−02  1.6822E−02 −2.3290E−03  1.3750E−04

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14,A16, A18 and A20 are aspheric surface coefficients.

y=(x ² /R)/{1+[1−(k+1)(x ² /R ²)]^(1/2) }+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰+A12x ¹² +A14x ¹⁴ +A16x ¹⁶ ±A18x ¹⁸ +A20x ²⁰  (1)

Herein, x denotes a vertical distance between a point in an asphericcurve and the optical axis, and y denotes an aspheric depth (i.e. avertical distance between the point having a distance of x from theoptical axis and a plane tangent to a vertex on the optical axis of anaspheric surface).

For convenience, an aspheric surface of each lens surface uses theaspheric surfaces shown in the above condition (1). However, the presentdisclosure is not limited to the aspherical polynomials form shown inthe condition (1).

Table 3 and Table 4 show design data of inflexion points and arrestpoints of each lens of the camera optical lens 10 in Embodiment 1 of thepresent disclosure. Herein, P1R1 and P1R2 represent the object-sidesurface and the image-side surface of the first lens L1, P2R1 and P2R2represent the object-side surface and the image-side surface of thesecond lens L2, P3R1 and P3R2 represent the object-side surface and theimage-side surface of the third lens L3, P4R1 and P4R2 represent theobject-side surface and the image-side surface of the fourth lens L4,P5R1 and P5R2 represent the object-side surface and the image-sidesurface of the fifth lens L5, P6R1 and P6R2 represent the object-sidesurface and the image-side surface of the sixth lens L6, P7R1 and P7R2represent the object-side surface and the image-side surface of theseventh lens L7, and P8R1 and P8R2 represent the object-side surface andthe image-side surface of the eighth lens L8. The data in the columnnamed “inflexion point position” refers to vertical distances frominflexion points arranged on each lens surface to the optic axis of thecamera optical lens 10. The data in the column named “arrest pointposition” refers to vertical distances from arrest points arranged oneach lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion pointinflexion points position 1 position 2 position 3 P1R1 1 0.925 / / P1R21 0.475 / / P2R1 1 0.555 / / P2R2 1 0.555 / / P3R1 2 0.495 0.685 / P3R22 0.715 1.245 / P4R1 2 0.385 0.885 / P4R2 2 0.465 0.835 / P5R1 2 0.1750.665 / P5R2 2 0.635 1.185 / P6R1 1 1.075 / / P6R2 1 1.195 / / P7R1 11.225 / / P7R2 2 0.305 1.555 / P8R1 3 0.235 1.505 1.705 P8R2 2 0.2551.885 /

TABLE 4 Number(s) of Arrest point Arrest point arrest points position 1position 2 P1R1 1 1.365 / P1R2 1 0.865 / P2R1 1 0.855 / P2R2 1 1.005 /P3R1 0 / / P3R2 1 1.015 / P4R1 2 0.645 1.065 P4R2 0 / / P5R1 2 0.2850.875 P5R2 1 0.875 / P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 1 0.545 /P8R1 1 0.405 / P8R2 1 0.455 /

FIG. 2 and FIG. 3 show a longitudinal aberration and a lateral color oflight with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nmafter passing the camera optical lens 10 in Embodiment 1. FIG. 4illustrates a schematic diagram of a field curvature and a distortion oflight with a wavelength of 546 nm after passing the camera optical lens10 in Embodiment 1. A field curvature S in FIG. 4 is a field curvaturein a sagittal direction, and T is a field curvature in a tangentialdirection.

Table 13 in the following shows various values of Embodiments 1, 2 and 3and values corresponding to the parameters specified in the aboveconditions.

As shown in Table 13, Embodiment 1 satisfies the various conditions.

In this Embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 10 is 2.751 mm, an image height (IH) of 1.0H is 2.300 mm,and a field of view (FOV) in a diagonal direction is 45.90°. Thus, thecamera optical lens 10 meets the design requirement for large aperture,long focal length and ultra-thinness. Its on-axis and off-axis chromaticaberrations are sufficiently corrected, thereby achieving excellentoptical performance.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1, and the meaning ofits symbols is the same as that of Embodiment 1. In the following, onlydifferences are described.

FIG. 5 shows a camera optical lens 20 in Embodiment 2 of the presentdisclosure.

Table 5 and Table 6 show design data of the camera optical lens 20 inEmbodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −0.313 R1 1.930 d1= 0.574 nd1 1.5450 v1 55.81R2 3.240 d2= 0.059 R3 6.019 d3= 0.207 nd2 1.6700 v2 19.39 R4 3.820 d4=0.052 R5 4.929 d5= 0.498 nd3 1.5450 v3 55.81 R6 −4.324 d6= 0.032 R73.136 d7= 0.265 nd4 1.6700 v4 19.39 R8 2.407 d8= 0.241 R9 −8.799 d9=0.234 nd5 1.6610 v5 20.53 R10 12.382 d10= 0.120 R11 2.458 d11= 0.368 nd61.6610 v6 20.53 R12 4.484 d12= 0.815 R13 −9.524 d13= 0.500 nd7 1.5450 v755.81 R14 3.740 d14= 0.244 R15 10.233 d15= 0.360 nd8 1.5450 v8 55.81 R167.787 d16= 0.255 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.550

Table 6 shows aspherical surface data of each lens of the camera opticallens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −2.3093E+00  5.3764E−03 2.0425E−02 −1.1590E−01  2.0804E−01−2.3995E−01  R2 −4.7591E+01 −1.2191E−01 4.9799E−01 −1.3551E+00 1.9192E+00 −1.5718E+00  R3 −5.5822E+00 −2.9237E−01 1.0497E+00−2.4028E+00  3.3303E+00 −2.9344E+00  R4 −6.5416E+01  7.8094E−02−3.7637E−01   8.4918E−01 −1.3785E+00 1.4905E+00 R5  1.0775E+01 1.1293E−01 −8.7728E−01   2.0227E+00 −2.7970E+00 2.6192E+00 R6−7.3893E+01  2.5199E−01 −1.3676E+00   3.2395E+00 −4.5093E+00 4.0662E+00R7 −6.5965E+01  2.3449E−01 −1.2109E+00   2.1905E+00 −2.4129E+001.8827E+00 R8 −4.8298E+00 −2.8933E−01 1.0506E+00 −3.5785E+00  7.3525E+00−9.4394E+00  R9 −6.8550E+02  3.7550E−02 8.3965E−01 −2.8249E+00 4.6022E+00 −4.6803E+00  R10  9.6366E+01  9.3947E−02 2.7587E−01−1.2634E+00  1.8897E+00 −1.7049E+00  R11 −1.0977E+01 −1.6146E−021.6790E−02 −1.7580E−02 −7.1923E−02 3.2166E−01 R12 −4.0067E+00−1.3164E−02 −3.1169E−03   1.3057E−01  4.6227E−03 −4.8105E−01  R13−9.9000E+01 −1.5214E−01 −7.6312E−02   4.4218E−01 −1.4279E+00 2.7101E+00R14 −1.7116E+01 −1.1333E−01 7.9455E−02 −5.6717E−02 −4.3741E−021.0999E−01 R15 −1.5890E+01 −2.3591E−01 2.0753E−01 −8.7227E−02−6.1890E−02 8.8277E−02 R16 −9.9000E+01 −1.9152E−01 1.3043E−01−5.5552E−02 −3.0027E−03 1.6261E−02 Conic coefficient Aspheric surfacecoefficients k A14 A16 A18 A20 R1 −2.3093E+00  1.7315E−01 −7.5531E−02  1.8163E−02 −1.8409E−03  R2 −4.7591E+01  7.7544E−01 −2.2603E−01  3.5076E−02 −2.1080E−03  R3 −5.5822E+00  1.6578E+00 −5.8069E−01  1.1443E−01 −9.6544E−03  R4 −6.5416E+01 −1.0195E+00 4.2331E−01−9.7627E−02 9.6187E−03 R5  1.0775E+01 −1.6048E+00 6.0252E−01 −1.2388E−011.0422E−02 R6 −7.3893E+01 −2.3717E+00 8.5614E−01 −1.7349E−01 1.5099E−02R7 −6.5965E+01 −1.0482E+00 3.9236E−01 −8.7693E−02 8.8616E−03 R8−4.8298E+00  7.8733E+00 −4.1739E+00   1.2809E+00 −1.7241E−01  R9−6.8550E+02  3.0345E+00 −1.1995E+00   2.6091E−01 −2.3806E−02  R10 9.6366E+01  1.0210E+00 −3.9460E−01   8.7693E−02 −8.3750E−03  R11−1.0977E+01 −4.0066E−01 2.2205E−01 −5.8048E−02 5.8597E−03 R12−4.0067E+00  1.1491E+00 −1.2311E+00   6.1542E−01 −1.1709E−01  R13−9.9000E+01 −3.0723E+00 2.0740E+00 −7.7216E−01 1.2180E−01 R14−1.7116E+01 −9.4051E−02 4.2723E−02 −1.0349E−02 1.0599E−03 R15−1.5890E+01 −4.6268E−02 1.2188E−02 −1.3312E−03 1.5038E−05 R16−9.9000E+01 −9.0535E−03 2.6821E−03 −4.4050E−04 3.1037E−05

Table 7 and table 8 show design data of inflexion points and arrestpoints of each lens of the camera optical lens 20 in Embodiment 2 of thepresent disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion pointsposition 1 position 2 P1R1 1 0.935 / P1R2 1 0.495 / P2R1 1 0.525 / P2R21 0.535 / P3R1 2 0.505 0.665 P3R2 2 0.735 1.205 P4R1 2 0.415 0.895 P4R22 0.485 0.835 P5R1 2 0.225 0.715 P5R2 2 0.655 1.185 P6R1 1 1.045 / P6R20 / / P7R1 1 1.225 / P7R2 2 0.445 1.545 P8R1 2 0.195 1.485 P8R2 2 0.2351.875

TABLE 8 Number(s) of Arrest point Arrest point arrest points position 1position 2 P1R1 0 / / P1R2 1 0.855 / P2R1 1 0.795 / P2R2 1 0.985 / P3R10 / / P3R2 1 1.015 / P4R1 2 0.725 1.045 P4R2 0 / / P5R1 2 0.375 0.915P5R2 1 0.895 / P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 1 0.785 / P8R1 10.345 / P8R2 1 0.425 /

FIG. 6 and FIG. 7 show a longitudinal aberration and a lateral color oflight with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nmafter passing the camera optical lens 20 in Embodiment 2. FIG. 8illustrates a schematic diagram of a field curvature and a distortion oflight with a wavelength of 546 nm after passing the camera optical lens20 in Embodiment 2. A field curvature S in FIG. 8 is a field curvaturein a sagittal direction, and T is a field curvature in a tangentialdirection.

As shown in Table 13, Embodiment 2 satisfies the various conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 20 is 2.750 mm, an image height (IH) of 1.0H is 2.300 mm,and a field of view (FOV) in a diagonal direction is 45.90°. Thus, thecamera optical lens 20 meets the design requirement for large aperture,long focal length and ultra-thinness. Its on-axis and off-axis chromaticaberrations are sufficiently corrected, thereby achieving excellentoptical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1, and the meaning ofits symbols is the same as that of Embodiment 1. In the following, onlydifferences are described.

FIG. 9 shows a camera optical lens 30 in Embodiment 3 of the presentdisclosure.

Table 9 and Table 10 show design data of the camera optical lens 30 inEmbodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0= −0.313 R1 2.000 d1= 0.606 nd1 1.5450 v1 55.81R2 4.152 d2= 0.040 R3 6.206 d3= 0.207 nd2 1.6700 v2 19.39 R4 3.311 d4=0.055 R5 4.874 d5= 0.484 nd3 1.5450 v3 55.81 R6 −5.385 d6= 0.032 R72.370 d7= 0.265 nd4 1.6700 v4 19.39 R8 2.073 d8= 0.237 R9 −9.043 d9=0.234 nd5 1.6610 v5 20.53 R10 11.911 d10= 0.096 R11 2.840 d11= 0.371 nd61.6610 v6 20.53 R12 5.568 d12= 0.756 R13 −20.385 d13= 0.500 nd7 1.5450v7 55.81 R14 3.734 d14= 0.327 R15 12.230 d15= 0.360 nd8 1.5450 v8 55.81R16 6.933 d16= 0.255 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18=0.551

Table 10 shows aspherical surface data of each lens of the cameraoptical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10A12 R1 −1.9215E+00 −4.1622E−04 9.6770E−03 −7.9187E−02 1.5085E−01−1.8664E−01 R2 −6.8177E+01 −1.8493E−01 8.3053E−01 −2.3779E+00 3.7386E+00−3.5271E+00 R3  5.2199E+00 −3.1391E−01 1.2475E+00 −3.2231E+00 4.9558E+00−4.7871E+00 R4 −6.0158E+01  2.1138E−02 −7.6166E−02   9.4459E−03−4.6563E−02   1.9904E−01 R5  1.0575E+01 −2.7094E−02 −2.6605E−01  6.6718E−01 −9.6566E−01   1.0553E+00 R6 −8.7795E+01  1.2678E−01−6.9410E−01   1.5466E+00 −1.8387E+00   1.2686E+00 R7 −2.9675E+01 1.2611E−01 −7.3763E−01   1.0485E+00 −5.8791E−01  −1.1127E−01 R8−4.4500E+00 −2.7398E−01 7.5836E−01 −2.4725E+00 5.2544E+00 −7.0532E+00 R9−5.0048E+02  9.3878E−02 5.0795E−01 −1.7616E+00 2.8071E+00 −2.8761E+00R10  9.0879E+01  1.6210E−01 5.8392E−02 −6.3011E−01 8.1164E−01−6.0159E−01 R11 −1.0467E+01 −7.9002E−03 −5.3386E−02   2.2554E−01−5.4090E−01   9.2678E−01 R12  1.4331E+01 −3.4624E−02 2.0309E−02 2.7956E−02 3.6380E−01 −1.2620E+00 R13  3.9566E+01 −1.6939E−01−7.1051E−03   2.0121E−01 −8.2327E−01   1.7092E+00 R14 −4.1627E+01−9.9466E−02 3.1479E−02 −3.4017E−02 −1.8805E−02   5.6490E−02 R15−2.1371E+01 −2.7361E−01 2.5357E−01 −2.2751E−01 1.4475E−01 −8.8092E−02R16 −9.9000E+01 −2.0457E−01 1.5454E−01 −1.0307E−01 4.5310E−02−1.3580E−02 Conic coefficient Aspheric surface coefficients k A14 A16A18 A20 R1 −1.9215E+00 1.4313E−01 −6.5455E−02 1.6359E−02 −1.7166E−03 R2−6.8177E+01 2.0752E+00 −7.4929E−01 1.5200E−01 −1.3239E−02 R3  5.2199E+002.9489E+00 −1.1248E+00 2.4173E−01 −2.2343E−02 R4 −6.0158E+01−2.2353E−01   1.1569E−01 −2.9370E−02   2.9860E−03 R5  1.0575E+01−7.5897E−01   3.2279E−01 −7.2806E−02   6.5511E−03 R6 −8.7795E+01−4.3664E−01   9.2791E−03 3.8143E−02 −7.8116E−03 R7 −2.9675E+014.1403E−01 −2.9208E−01 9.6052E−02 −1.2538E−02 R8 −4.4500E+00 6.1765E+00−3.4389E+00 1.1073E+00 −1.5599E−01 R9 −5.0048E+02 1.9213E+00 −7.8680E−011.7649E−01 −1.6484E−02 R10  9.0879E+01 3.1556E−01 −1.1972E−01 2.8429E−02−2.9846E−03 R11 −1.0467E+01 −9.1211E−01   4.7912E−01 −1.2646E−01  1.3242E−02 R12  1.4331E+01 2.2196E+00 −2.1022E+00 9.9335E−01−1.8429E−01 R13  3.9566E+01 −2.0465E+00   1.4445E+00 −5.6126E−01  9.2706E−02 R14 −4.1627E+01 −5.0064E−02   2.3158E−02 −5.5785E−03  5.6193E−04 R15 −2.1371E+01 4.3931E−02 −1.3244E−02 2.0872E−03−1.3509E−04 R16 −9.9000E+01 3.5283E−03 −8.4809E−04 1.3274E−04−8.5863E−06

Table 11 and Table 12 show design data of inflexion points and arrestpoints of each lens of the camera optical lens 30 in Embodiment 3 of thepresent disclosure.

TABLE 11 Number(s) of Inflexion point Inflexion point Inflexion pointinflexion points position 1 position 2 position 3 P1R1 1 0.935 / / P1R21 0.455 / / P2R1 1 0.485 / / P2R2 1 0.515 / / P3R1 3 0.565 0.595 1.325P3R2 2 0.685 1.175 / P4R1 2 0.425 0.895 / P4R2 2 0.485 0.815 / P5R1 20.225 0.765 / P5R2 2 0.695 1.185 / P6R1 1 1.005 / / P6R2 0 / / / P7R1 11.195 / / P7R2 2 0.385 1.475 / P8R1 2 0.165 1.395 / P8R2 2 0.245 1.895 /

TABLE 12 Number(s) of Arrest point Arrest point arrest points position 1position 2 P1R1 0 / / P1R2 1 0.755 / P2R1 1 0.735 / P2R2 1 0.985 / P3R10 / / P3R2 1 0.965 / P4R1 0 / / P4R2 0 / / P5R1 2 0.375 1.005 P5R2 10.965 / P6R1 0 / / P6R2 0 / / P7R1 0 / / P7R2 1 0.685 / P8R1 1 0.285 /P8R2 1 0.425 /

FIG. 10 and FIG. 11 show a longitudinal aberration and a lateral colorof light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nmafter passing the camera optical lens 30 in Embodiment 3. FIG. 12illustrates a schematic diagram of a field curvature and a distortion oflight with a wavelength of 546 nm after passing the camera optical lens30 in Embodiment 3. A field curvature S in FIG. 12 is a field curvaturein a sagittal direction, and T is a field curvature in a tangentialdirection.

Table 13 in the following shows values corresponding to variousconditions according to the aforementioned conditions in thisembodiment. Apparently, the camera optical lens 30 in this embodimentsatisfies the aforementioned conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the cameraoptical lens 30 is 2.750 mm, an image height (IH) of 1.0H is 2.300 mm,and a field of view (FOV) in a diagonal direction is 45.90°. Thus, thecamera optical lens 30 meets design requirements for large aperture,long focal length and ultra-thinness. Its on-axis and off-axis chromaticaberrations are sufficiently corrected, thereby achieving excellentoptical performance.

TABLE 13 Parameters and conditions Embodiment 1 Embodiment 2 Embodiment3 f/TTL 0.96 0.96 0.96 f2/f −3.99 −2.99 −2.01 (R7 + R8)/(R7 − R8) 2.537.60 14.96 f 5.364 5.361 5.362 f1 8.156 7.552 6.410 f2 −21.406 −16.032−10.778 f3 3.526 4.290 4.754 f4 −6.492 −17.905 −38.230 f5 −9.897 −7.660−7.655 f6 6.420 7.588 8.221 f7 −4.177 −4.842 −5.724 f8 −286.565 −62.783−29.964 f12 11.924 12.503 12.873 FNO 1.95 1.95 1.95 TTL 5.588 5.5845.586 IH 2.300 2.300 2.300 FOV 45.90° 45.90° 45.90°

It will be understood by those of ordinary skills in the art that theembodiments described above are specific embodiments realizing thepresent disclosure. In practice, various changes may be made to theseembodiments in form and in detail without departing from the spirit andscope of the disclosure.

What is claimed is:
 1. A camera optical lens comprising, from an objectside to an image side in sequence: a first lens having a positiverefractive power, a second lens, a third lens, a fourth lens, a fifthlens, a sixth lens, a seventh lens and an eighth lens; wherein thecamera optical lens satisfies following conditions:0.95≤f/TTL;−4.00≤f2/f≤−2.00; and2.50≤(R7+R8)/(R7−R8)≤15.00; where f denotes a focal length of the cameraoptical lens; TTL denotes a total optical length from an object-sidesurface of the first lens to an image surface of the camera optical lensalong an optical axis; f2 denotes a focal length of the second lens; R7denotes a central curvature radius of an object-side surface of thefourth lens; and R8 denotes a central curvature radius of an image-sidesurface of the fourth lens.
 2. The camera optical lens according toclaim 1, wherein the camera optical lens further satisfies the followingcondition:2.00≤d12/d14≤7.50; where d12 denotes an on-axis distance from animage-side surface of the sixth lens to an object-side surface of theseventh lens; and d14 denotes an on-axis distance from an image-sidesurface of the seventh lens to an object-side surface of the eighthlens.
 3. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies following conditions:0.60≤f1/f≤2.28;−9.39≤(R1+R2)/(R1−R2)≤−1.91; and0.05≤d1/TTL≤0.16; where f1 denotes a focal length of the first lens; R1denotes a central curvature radius of the object-side surface of thefirst lens; R2 denotes a central curvature radius of an image-sidesurface of the first lens; and d1 denotes an on-axis thickness of thefirst lens.
 4. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies following conditions:1.64≤(R3+R4)/(R3−R4)≤9.23; and0.02≤d3/TTL≤0.06; where R3 denotes a central curvature radius of anobject-side surface of the second lens; R4 denotes a central curvatureradius of an image-side surface of the second lens; and d3 denotes anon-axis thickness of the second lens.
 5. The camera optical lensaccording to claim 1, wherein the camera optical lens further satisfiesfollowing conditions:0.33≤f3/f≤1.33;−0.10≤(R5+R6)/(R5−R6)≤0.35; and0.04≤d5/TTL≤0.14; where f3 denotes a focal length of the third lens; R5denotes a central curvature radius of an object-side surface of thethird lens; R6 denotes a central curvature radius of an image-sidesurface of the third lens; and d5 denotes an on-axis thickness of thethird lens.
 6. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies following conditions:−14.26≤f4/f≤−0.81; and0.02≤d7/TTL≤0.08; where f4 denotes a focal length of the fourth lens;and d7 denotes an on-axis thickness of the fourth lens.
 7. The cameraoptical lens according to claim 1, wherein the camera optical lensfurther satisfies following conditions:−3.69≤f5/f≤−0.95;−0.34≤(R9+R10)/(R9−R10)≤0.10; and0.02≤d9/TTL≤0.06; where f5 denotes a focal length of the fifth lens; R9denotes a central curvature radius of an object-side surface of thefifth lens; R10 denotes a central curvature radius of an image-sidesurface of the fifth lens; and d9 denotes an on-axis thickness of thefifth lens.
 8. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies following conditions:0.60≤f6/f≤2.30;−6.85≤(R11+R12)/(R11−R12)≤−2.05; and0.03≤d11/TTL≤0.10; where f6 denotes a focal length of the sixth lens;R11 denotes a central curvature radius of an object-side surface of thesixth lens; R12 denotes a central curvature radius of an image-sidesurface of the sixth lens; and d11 denotes an on-axis thickness of thesixth lens.
 9. The camera optical lens according to claim 1, wherein thecamera optical lens further satisfies following conditions:−2.14≤f7/f≤−0.52;−1.06≤(R13+R14)/(R13−R14)≤1.04; and0.04≤d13/TTL≤0.13; where f7 denotes a focal length of the seventh lens;R13 denotes a central curvature radius of an object-side surface of theseventh lens; R14 denotes a central curvature radius of an image-sidesurface of the seventh lens; and d13 denotes an on-axis thickness of theseventh lens.
 10. The camera optical lens according to claim 1, whereinthe camera optical lens further satisfies following conditions:−106.85≤f8/f≤−3.73;1.81≤(R15+R16)/(R15−R16)≤48.17; and0.03≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens;R15 denotes a central curvature radius of an object-side surface of theeighth lens; R16 denotes a central curvature radius of an image-sidesurface of the eighth lens; and d15 denotes an on-axis thickness of theeighth lens.
 11. The camera optical lens according to claim 1, whereinthe camera optical lens further satisfies following conditions:f/IH≥2.33; where IH denotes an image height of the camera optical lens.